The idea is fine, though the execution seems obnoxious for getting your writing out of your system. The trouble is, depending on what you’re writing, Tilde might be a massive downgrade. For novels, I find something like Scrivener essential.

I’ve looked into a few options like this over the years (e.g. the Freewrite, or even an old Alphasmart), but always came to the conclusion they added more friction to my writing process, not less.